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  • 1
    Publikationsdatum: 2017-04-04
    Beschreibung: In the last four decades, Campi Flegrei caldera has been the world’s most active caldera characterized by intense unrest episodes involving huge ground deformation and seismicity, but, at the time of writing, has not culminated in an eruption. We present a careful review, with new analyses and interpretation, of all the data and recent research results. We deal with three main problems: the tentative reconstruction of the substructure; the modelling of unrest episodes to shed light on possible pre-eruptive scenarios; and the probabilistic estimation of the hazards from explosive pyroclastic products. The results show, for the first time at a volcano, that a very peculiar mechanism is generating episodes of unrest, involving mainly activation of the geothermal system from deeper magma reservoirs. The character and evolution of unrest episodes is strongly controlled by structural features, like the ring-fault system at the borders of the caldera collapse. The use of detailed volcanological, mathematical and statistical procedures also make it possible to obtain a detailed picture of eruptive hazards in the whole Neapolitan area. The complex behaviour of this caldera, involving interaction between magmatic and geothermal phenomena, sheds light on the dynamics of the most dangerous types of volcanoes in the world.
    Beschreibung: Published
    Beschreibung: 25-45
    Beschreibung: open
    Schlagwort(e): NONE ; 04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
    Format: 684147 bytes
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 2017-04-04
    Beschreibung: The levelling data at Colli Albani volcanic area in the period 1950–2006, describing the main results obtained in the last 60 years are analysed. In particular, the focus is on the last two double run levellings, carried out in 2002 and 2006 respectively. Before performing these surveys, the levelling network configuration had been improvedwith the installation of new benchmarks, taking into account the ground movements inferred fromprevious studies. The data analysis shows that the strong uplift (with a maximum value of about 30 cm), occurred in the period 1950–1994 along the NW–SE levelling line bordering the SW sector of the Colli Albani caldera — Amato and Chiarabba (Geophys Res Lett 22:1985–1988, 1995); Chiarabba et al. (Bull Volcanol 59:161–170, 1997); Feuillet et al. (J Geophys Res 109:B02308, 2004); Salvi et al. (Geophys Res Lett 31:L12606, 2004); Anzidei et al. (J Volcanol Geother Res 80:55–65, 1998); Riguzzi et al. (Phys Earth Plan Inter 177:79–87, 2009) seems to have stopped after 1994. In fact, at least for the areas covered by the 1997/1999 and 2002 levelling surveys, a subsidence was highlighted in the same area previously affected by the uplift, with maximum rates similar in modulus. On the other hand, from 2002 to 2006 there is evidence of a substantial stability in the southern part of the investigated area, while in the northern area from Albano Lake to Rome, a sharp uplift (maximum value of about 3 cm) is registered.
    Beschreibung: Published
    Beschreibung: 203 – 214
    Beschreibung: 1IT. Reti di monitoraggio e Osservazioni
    Beschreibung: N/A or not JCR
    Beschreibung: restricted
    Schlagwort(e): ground deformation ; precision leveling ; Colli Albani ; Volcanism ; 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Publikationsdatum: 2020-02-24
    Beschreibung: Results of observations of the Mt. Vesuvius caldera, carried out by means of terrestrial laser scanning (TLS) in May 2005, October 2006 and June 2009, are reported here. In each survey the whole crater was acquired with 17/20 scans from 6 different viewpoints and the corresponding digital surface models were generated and registered into the UTM-WGS84 reference frame. In this way, a comparison between the multitemporal models leads to an evaluation of the occurred changes. The deformation maps, i.e. the contouring plots of the differences between the models along the direction of maximum variations, showed a progressive mass loss due to rock-falls from the NE vertical crater wall whose area was about View the MathML source. The TLS data also showed the accumulation at the bottom. The volume loss which occurred from 2005 to 2009, was computed by subtraction of volumes defined with respect to reference planes parallel to the caldera walls and was estimated to be View the MathML source. The volume uncertainties due to registration errors, subsampling noise effects, and effects due to choice of the reference plane, were also estimated. Some results were also interpreted on the basis of micro-seismic and meteorological data in order to plan a monitoring technique where seismic signals related to rock-fall and/or signals of intense rainfalls are used as alarms for fast TLS surveys able to characterize the corresponding changes of the caldera walls. The proposed methodology, in particular the simple but effective approach used in the estimation of volume uncertainties, can be applied to each rock slope instability phenomenon, regardless of the particular environment.
    Beschreibung: Published
    Beschreibung: 327–336
    Beschreibung: JCR Journal
    Beschreibung: restricted
    Schlagwort(e): Terrestrial laser scanning ; 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
    Standort Signatur Erwartet Verfügbarkeit
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